The enzyme, ribulose bisphosphate carboxylase, catalyzes the first step in carbon dioxide fixation. The substrates for this enzyme are

In an inducible operon, the regulator gene codes for a repressor protein that binds to the operator. When an inducer is present, the

Chromosomal abnormalities such as Down Syndrome (trisomy 21) and Klinefelter Syndrome (XXY) result from errors in

Two alleles for flower color in snapdragons show incomplete dominance. Plants with pink flowers are the offspring of a cross between plants with white flowers and plants with red flowers. Which of the following crosses would produce a true-breeding line of plants with pink flowers?

During the dark reactions of photosynthesis

The products of the light reactions of photosynthesis are

What is the proper sequence of these four stages during meiosis?

Cancer cells typically

Hemophilia is a sex-linked recessive disorder characterized by the inability to properly form blood clots. Hemophilia is known as the “Royal Disease” because of its presence in the royal families of Europe as a result of its appearance in the children of Queen Victoria. The pedigree above shows the family of Victoria’s daughter Alice. Alice passed hemophilia to the German and Russian imperial families. Alice’s daughter Alix (a carrier of hemophilia) married Tsar Nikolas II of Russia and they had 5 children—4 girls and 1 boy. The boy, Alexis, had hemophilia. The girls were all killed during the Russian revolution and it is unknown whether they were carriers of the disease. What is the probability that all 4 daughters were carriers of hemophilia?

How is a child with X and Y chromosomes best described?